MAX7415EUA+T

Overview

The MAX7415EUA+T is a fifth-order, lowpass, elliptic switched-capacitor filter designed for single-supply operation at +3V. It features a clock-tunable corner frequency ranging from 1Hz to 15kHz with a fixed transition ratio of 1.25 and typical stopband rejection of 37dB. The device operates with a supply current of 1.2mA in active mode and reduces to 0.2µA in shutdown mode. It supports both internal oscillator configuration via an external capacitor and external clocking. The component is housed in an 8-pin µMAX package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Fifth-order elliptic lowpass architecture providing sharp rolloff characteristics
• Clock-tunable corner frequency adjustable between 1Hz and 15kHz
• Low-power operation with dedicated shutdown mode reducing current consumption
• Single-supply compatibility optimized for +3V systems

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing

Procurement Notes

Verify the specific suffix 'EUA' confirms the extended industrial temperature range (-40°C to +85°C) and the 'T' indicates reel packaging. Confirm RoHS compliance status through official manufacturer documentation prior to procurement. Ensure the +3V supply requirement aligns with system power rails.

Selection Notes

Select this component when a steep rolloff with a transition ratio of 1.25 is required for +3V applications. Compare against MAX7408/MAX7412 if higher stopband rejection (53dB) is prioritized over rolloff sharpness. Verify that the input signal amplitude remains within limits to maintain total harmonic distortion plus noise below -80dB.

Part Context

This part belongs to the MAX7408/MAX7411/MAX7412/MAX7415 family of elliptic switched-capacitor filters. While sharing similar architectural features, the MAX7415 is specifically differentiated by its +3V operating voltage and 1.25 transition ratio, distinguishing it from the +5V variants and those with different rolloff characteristics.

Replacement Considerations

The MAX7412 serves as a functional substitute within the same family but requires a +3V supply and offers a transition ratio of 1.6 rather than 1.25. The MAX7411 provides the same 1.25 transition ratio but operates at +5V. Package variations exist but require verification of pinout compatibility.

FAQ

How is the corner frequency determined?

The corner frequency is set by the clock frequency using a fixed 100:1 ratio. It can be achieved via an internal oscillator controlled by an external capacitor on the CLK pin or by driving the CLK pin with an external clock signal.

What is the purpose of the OS pin?

The Offset Adjust (OS) pin allows for adjustment of the DC output level. If no offset adjustment is needed, it should be connected to the COM pin.

How does the device handle shutdown?

Driving the SHDN pin low activates shutdown mode, reducing supply current to 0.2µA and placing the output in a high-impedance state. Driving SHDN high or connecting it to VDD enables normal operation.